Looking good!
Two suggestions:
First, check soil & water alkalinity. You may need to put down lime, and it is cheaper to do it now than when BOW is full of water.
Second, some fish habitat.
What is the best way to check soil alkalinity?
Can fish habitat be added after we find out if our efforts were successful?
Don't know about soil, perhaps others here do.
If you have well water or other water source for it, you can send a sample to Texas A&M for analysis. That's what I did & how I found out needed ag lime (though I underestimated how much!).
As for habitat, that's entirely up to you. I had some done, but not nearly what I should have. In my case, timber & rock. But it wasn't adequate, needed a lot more brush to help YOY fish hide.
Only reason I mentioned it is that it is much easier to place before the pond fills up.
Just looking at the shape of your future BOW, I'd think placing habitat in the corners might be smart. Fish like a break in the routine, and I've always found such spots productive.
Best of luck! It's a great adventure...
